Commodore 64 - Page 64

DEC
Decrement Memory by One
Operation: M — 1 -> M
X z C I D V
yy
-----
Addressing
Mode
Assembly Language
Form
OP
CODE
No.
Bytes
No.
Cycles
Zero Page
DEC
aa C6
2
5
Zero Page, X
DEC aa,X
D6 2
6
Absolute
DEC aaaa
CE
3
6
Absolute, X
DEC aaaa,X
DE
3
7
DEX
Decrement Index X by One
Operation: X — 1 -> X
NZCIDV
yy
-----
Addressing
Mode
Assembly Language
Form
OP
CODE
No.
Bytes
No.
Cycles
Im plied DEX CA
1 2
DEY
Decrement Index Y by One
O p e r a t i o n : Y — 1 -» Y
N Z C I D V
J J
----
Addressing
Mode
Assembly Language
Form
OP
CODE
No.
Bytes
No.
Cycles
Im plied DEY
88 1
2
62